From the plaintiffs’ press release:

The Council of Canadians, the Canadian Federation of Students and three individual electors will file a Charter challenge to the Fair Elections Act (Bill C-23) in the Ontario Superior Court today.

Recent changes to Canada’s election laws will interfere with the rights of Canadians to vote in federal elections and remove access to reliable information about the electoral process and investigations. Bill C-23 removed multiple measures for electors to prove their identity, stripped the Chief Electoral Officer of independence and powers of communication and investigation, and made the Office of the Commissioner of Canada Elections accountable to partisan interests instead of the Canadian public.

More here.  I’ll post the actual legal filings if/when I can get them.